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Qian Xiaodong,Qin Jiazheng,Liu Lifang
Author NameAffiliation
Qian Xiaodong Earthquakes Administration of Yunnan Province, Kunming 650224,China 
Qin Jiazheng Earthquakes Administration of Yunnan Province, Kunming 650225,China 
Liu Lifang Earthquakes Administration of Yunnan Province, Kunming 650226,China 
Study on the Recent Tectonic Stress Field in the Yunnan Region
Qian Xiaodong1, Qin Jiazheng2, Liu Lifang3
1.Earthquakes Administration of Yunnan Province, Kunming 650224,China;2.Earthquakes Administration of Yunnan Province, Kunming 650225,China;3.Earthquakes Administration of Yunnan Province, Kunming 650226,China
In this paper, using focal mechanism solutions of moderate-strong earthquakes in Yunnan and its adjacent areas, and based on the statistical analysis of the parameters of focal mechanism solutions, we discussed in detail the earthquake fault types and the characteristics of the modern tectonic stress field in the Yunnan region. The results show that most moderate-strong earthquakes occurring in the Yunnan region are of the strike-slip type, amounting to 80% of the total. Normal faulting and normal with strike-slip and reverse and reverse with strike-slip earthquakes is almost equivalent in proportion, about 8% each. The tectonic stress field of the Yunnan region is near-horizontal, and the dips of earthquake fault planes are large. There are three main dynamic sources acting on the Yunnan region: one is the NE, NNE and NNW-directed acting force from Myanmar, Laos and Vietnam; the second is the SE-SSE directed force from the Sichuan and Sichuan-Yunnan rhombus block and the third is the NW-NNW directed force from the South China block. These three acting forces have controlled the faulting behavior of the main faults and the characteristics of strong earthquake activity of Yunnan and its adjacent regions.
Key words:  Focal mechanism solution  Earthquake classification  Tectonic stress field  The Yunnan region